Spatial distributions of acoustic field scattered at the sea bottom-numerical model

The results of the numerical simulation of acoustic wave scattering from rough and attenuating sea bottom are presented. Seattering is studied using ray theory with the main geometry of model taken from Novarini and Caruthers. The distribution of rough surface heights together with bottom acoustical parameters determine the scattered acoustical field properties. Different bottom types with various acoustical parameters have been used in numerical calculations in order to examine the influence of phase shift of reflected signal on scattered acoustical field. Simulation technique was made for surfaces with normal distribution of heights and standard deviation of the surface elevation, 0.01 m. Spatial distribution of the scattered field parameters was determined. Results of calculations for frequencies between 5 and 100 kHz and various bottom parameters are compared.